| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 0 | <12 months | 400 |
9.1%
|
| 1 | 1 year | 353 |
8%
|
| 2 | 2 years | 844 |
19.2%
|
| 3 | 3 years | 1323 |
30.1%
|
| 4 | 4 years | 729 |
16.6%
|
| 5 | 5 years | 355 |
8.1%
|
| 6 | 6+ years | 85 |
1.9%
|
| 7 | non-numeric | 82 |
1.9%
|
| 8 | don't know | 230 |
5.2%
|
| Sysmiss | 1552 |